With all due respect Tom, I think you missed the point. The important thing was not the physical removal of Dr. David Dao but rather how corporations are willing to deceive people.
The United flight was fully booked and the passengers were boarded, but the agents assigned to work this flight realized that the company also needed to board four employees. The agents told the passengers that four names were chosen at random and those four passengers needed to exit the plane.
What the agents did not say was the airline had no right to do this. United was depending on the passengers not knowing the law or their rights and thus being easily deceived and intimidated into giving up their seats and leaving the plane.
Three passengers left but Dr. Dao put a monkey wrench in their plan when he refused. As a result of the video of his refusal, the entire fraud was exposed, and we can see that corporations are willing to ignore the law, injure someone, and commit fraud, to protect their right to maximize profits above the rights and well being of people.